AAL's in general put stresses on your original leaf pak because they put your original leaf pak at a un-natural arch (weren't designed for it). The AAL can eventually sag over time. Adding a 2nd AAL isn't a good idea either and not any different than adding one - its still puts stresses on your original leaf pak.

Stacking them is not a good idea. They have multiple leaf kits available with AAL leafs that have the same arch & different lengths. But again, read above.

You can go to a spring shop and have them custom make a multiple leaf AAL setup but they'll probably tell you to re-arch the entire leaf pak. That's the only way it can be done 'right' - is by making sure ALL leafs in the pak have the same arch.

What's your purpose for wanting to stack AAL's? Don't skimp.... don't stack AAL's. Either run with ONE AAL, a designed multiple leaf kit, or get a new aftermarket leaf pak and don't exceed the towing/hauling capacity of your truck (see owners manual for that info).

Well I already have a aal in the rear and a 4 inch block and my rear is still quite a bit lower than my front.

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Dude, that's impossible. Do you already have an aftermarket lift on the front? It's gotta be a 4 or a 6" lift kit on the front.

And as I mentioned earlier....AAL's can sag over time. You should just replace the AAL that's in there with a new one or get an aftermarket replacement leaf pak. But first, you need to know exactly what type of kit you have in the front and exactly what AAL you have in the rear.